81468481 has 2 divisors, whose sum is σ = 81468482. Its totient is φ = 81468480.

The previous prime is 81468469. The next prime is 81468503. The reversal of 81468481 is 18486418.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61074225 + 20394256 = 7815^2 + 4516^2 .

It is a cyclic number.

It is not a de Polignac number, because 81468481 - 2¹³ = 81460289 is a prime.

It is a super-2 number, since 2×81468481² = 13274226792894722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (81468421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40734240 + 40734241.

It is an arithmetic number, because the mean of its divisors is an integer number (40734241).

Almost surely, 2^81468481 is an apocalyptic number.

It is an amenable number.

81468481 is a deficient number, since it is larger than the sum of its proper divisors (1).

81468481 is an equidigital number, since it uses as much as digits as its factorization.

81468481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 49152, while the sum is 40.

The square root of 81468481 is about 9025.9891978663. The cubic root of 81468481 is about 433.5074242642.

The spelling of 81468481 in words is "eighty-one million, four hundred sixty-eight thousand, four hundred eighty-one".